【RabbitMQ】——Spring AMQP

本博文首先让大家对Spring AMQP有个初步认识。接下来的系列博客中，会对其逐步深入。
目前国内大部分软件行业都在使用Spring平台框架，在Spring AMQP中包括两大部分：spring-amqp 和spring-rabbit。
spring-amqp是对高级消息队列协议（amqp）的支持和抽象
spring-rabbit是Spring集成的 对MQ的 实现：Spring选择的是RabbitMQ。RabbitMQ是基于amqp实现的。——从Spring的选择来看，RabbitMQ在国内是处于举足轻重的地位。

Spring AMQP特性：
1、用于异步处理入站邮件的侦听器容器
2、RabbitTemplate发送和接收消息
3、RabbitAdmin用于自动声明队列，交换和绑定

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快速起步，看效果，填满自信感~~
在项目中使用spring-amqp，Spring官网推荐使用依赖关系管理系统，如：maven
则可以将如下代码贴到pom文件中

<dependencies>
    <dependency>
        <groupId>org.springframework.amqp</groupId>
        <artifactId>spring-rabbit</artifactId>
        <version>1.7.3.RELEASE</version>
    </dependency>
</dependencies>

如果单纯java代码实现，如下：

public static void main(final String... args) throws Exception {

    ConnectionFactory cf = new CachingConnectionFactory();

    // set up the queue, exchange, binding on the broker
    RabbitAdmin admin = new RabbitAdmin(cf);
    Queue queue = new Queue("myQueue");
    admin.declareQueue(queue);
    TopicExchange exchange = new TopicExchange("myExchange");
    admin.declareExchange(exchange);
    admin.declareBinding(
        BindingBuilder.bind(queue).to(exchange).with("foo.*"));

    // set up the listener and container
    SimpleMessageListenerContainer container =
            new SimpleMessageListenerContainer(cf);
    Object listener = new Object() {
        public void handleMessage(String foo) {
            System.out.println(foo);
        }
    };
    MessageListenerAdapter adapter = new MessageListenerAdapter(listener);
    container.setMessageListener(adapter);
    container.setQueueNames("myQueue");
    container.start();

    // send something
    RabbitTemplate template = new RabbitTemplate(cf);
    template.convertAndSend("myExchange", "foo.bar", "Hello, world!");
    Thread.sleep(1000);
    container.stop();
}

如果在Spring中应用：

public static void main(final String... args) throws Exception {

    AbstractApplicationContext ctx =
        new ClassPathXmlApplicationContext("context.xml");
    RabbitTemplate template = ctx.getBean(RabbitTemplate.class);
    template.convertAndSend("Hello, world!");
    Thread.sleep(1000);
    ctx.destroy();
}

public class Foo {

    public void listen(String foo) {
        System.out.println(foo);
    }
}

<rabbit:connection-factory id="connectionFactory" />

<rabbit:template id="amqpTemplate" connection-factory="connectionFactory"
    exchange="myExchange" routing-key="foo.bar"/>

<rabbit:admin connection-factory="connectionFactory" />

<rabbit:queue name="myQueue" />

<rabbit:topic-exchange name="myExchange">
    <rabbit:bindings>
        <rabbit:binding queue="myQueue" pattern="foo.*" />
    </rabbit:bindings>
</rabbit:topic-exchange>


<rabbit:listener-container connection-factory="connectionFactory">
    <rabbit:listener ref="foo" method="listen" queue-names="myQueue" />
</rabbit:listener-container>

<bean id="foo" class="foo.Foo" />